<?php
// +----------------------------------------------------------------------
// | ThinkPHP [ WE CAN DO IT JUST THINK IT ]
// +----------------------------------------------------------------------
// | Copyright (c) 2009 http://thinkphp.cn All rights reserved.
// +----------------------------------------------------------------------
// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
// +----------------------------------------------------------------------
// | Author: liu21st <liu21st@gmail.com>
// |         lanfengye <zibin_5257@163.com>
// +----------------------------------------------------------------------

class Page {
    
    // 分页栏每页显示的页数
    public $rollPage = 5;
    // 页数跳转时要带的参数
    public $parameter  ;
    // 分页URL地址
    public $url     =   '';
    // 默认列表每页显示行数
    public $listRows = 20;
    // 起始行数
    public $firstRow    ;
    // 分页总页面数
    public $totalPages  ;
    // 总行数
    protected $totalRows  ;
    // 当前页数
    protected $nowPage    ;
    // 分页的栏的总页数
    protected $coolPages   ;
    // 分页显示定制
    protected $config  =    array('header'=>'条记录','prev'=>'上一页','next'=>'下一页','first'=>'第一页','last'=>'最后一页','theme'=>'%upPage% %first% %prePage% %linkPage% %nextPage% %end% %downPage% <span class="layui-laypage-last">共%totalPage%页</span>');
    // protected $config  =    array('header'=>'条记录','prev'=>'<span id="previous_page">上一页</span>','next'=>'<span id="next_page">下一页</span>','first'=>'第一页','last'=>'最后一页','theme'=>'  %upPage%  %first%  %prePage%  %linkPage% <span class="layui-laypage-count">共%totalPage%页<span id="curren_page" style="display:none;">%nowPage%</span>&nbsp;</span>%downPage% %nextPage% %end%');
    // protected $config  =    array('header'=>'条记录','prev'=>'上一页','next'=>'下一页','first'=>'第一页','last'=>'最后一页','theme'=>' <span>%totalRow% %header% %nowPage%/%totalPage% 页</span> %upPage% %downPage% %first%  %prePage%  %linkPage%  %nextPage% %end%');
    // 默认分页变量名
    protected $varPage;

    /**
     * 架构函数
     * Page constructor.
     * @param string $totalRows 总的记录数
     * @param string $listRows 每页显示记录数
     * @param string $parameter 分页跳转的参数
     * @param string $url
     */
    public function __construct($totalRows,$listRows='',$parameter='',$url='') {
        $this->totalRows    =   $totalRows;
        $this->parameter    =   $parameter;
        $this->varPage      =   config('VAR_PAGE') ? config('VAR_PAGE') : 'p' ;
        if(!empty($listRows)) {
            $this->listRows =   intval($listRows);
        }
        $this->totalPages   =   ceil($this->totalRows/$this->listRows);     //总页数
        $this->coolPages    =   ceil($this->totalPages/$this->rollPage);
        $this->nowPage      =   input('param.'. $this->varPage,1,'intval');
        if($this->nowPage<1){
            $this->nowPage  =   1;
        }elseif(!empty($this->totalPages) && $this->nowPage>$this->totalPages) {
            $this->nowPage  =   $this->totalPages;
        }
        $this->firstRow     =   $this->listRows*($this->nowPage-1);
        if(!empty($url))    $this->url  =   $url; 
    }

    public function setConfig($name,$value) {
        if(isset($this->config[$name])) {
            $this->config[$name]    =   $value;
        }
    }

    /**
     * 分页显示输出
     * @access public
     */
    public function show() {
        if(0 == $this->totalRows) return '';
        $p              =   $this->varPage;
        $nowCoolPage    =   ceil($this->nowPage / $this->rollPage);

        // 分析分页参数
        if($this->url){
            $depr       =   config('URL_PATHINFO_DEPR');
            $url        =   rtrim(url('/' . $this->url, '', false), $depr) . $depr . '__PAGE__';
        }else{
            if($this->parameter && is_string($this->parameter)) {
                parse_str($this->parameter,$parameter);
            }elseif(is_array($this->parameter)){
                $parameter      =   $this->parameter;
            }elseif(empty($this->parameter)){
                unset($_GET[config('VAR_URL_PARAMS')]);
                $var =  !empty($_POST) ? $_POST : $_GET;
                if(empty($var)) {
                    $parameter  =   array();
                }else{
                    $parameter  =   $var;
                }
            }
            $parameter[$p]  =   '__PAGE__';
            $url            =   url('') . '?' . http_build_query($parameter);
        }
        //上下翻页字符串
        $upRow          =   $this->nowPage-1;
        $downRow        =   $this->nowPage+1;
        if ($upRow>0){
            $upPage     = '<a href="' . str_replace('__PAGE__', $upRow, $url) . '" class="layui-laypage-prev">' . $this->config['prev'] . '</a>';
        }else{
            $upPage     =   '';
        }

        if ($downRow <= $this->totalPages){
            $downPage   =   '<a href="' . str_replace('__PAGE__', $downRow, $url) . '" class="layui-laypage-next">' . $this->config['next'] . '</a>';
        }else{
            $downPage   =   '';
        }
        // << < > >>
        if($nowCoolPage == 1){
            $theFirst   =   '';
            $prePage    =   '';
        }else{
            $preRow     =   $this->nowPage-$this->rollPage;
            $prePage    =   '<a href="' . str_replace('__PAGE__', $preRow, $url) . '" class="layui-laypage-prev">上' . $this->rollPage . '页</a>';
            $theFirst   =   '<a href="' . str_replace('__PAGE__', 1, $url) . '" class="layui-laypage-first">' . $this->config['first'] . '</a>';
        }
        if($nowCoolPage == $this->coolPages){
            $nextPage   =   '';
            $theEnd     =   '';
        }else{
            $nextRow    =   $this->nowPage+$this->rollPage;
            $theEndRow  =   $this->totalPages;
            $nextPage   =   '<a href="' . str_replace('__PAGE__', $nextRow, $url) . '" class="layui-laypage-next">下' . $this->rollPage . '页</a>';
            $theEnd     =   '<a href="' . str_replace('__PAGE__', $theEndRow, $url) . '" class="layui-laypage-last">' . $this->config['last'] . '</a>';
        }
        // 1 2 3 4 5
        $linkPage = '';
        for($i = 1; $i <= $this->rollPage; $i++){
            $page       =   ($nowCoolPage-1) * $this->rollPage + $i;
            if($page != $this->nowPage){
                if($page <= $this->totalPages){
                    $linkPage .= '<a href="' . str_replace('__PAGE__', $page, $url) . '">' . $page . '</a>';
                }else{
                    break;
                }
            }else{
                if($this->totalPages != 1){
                    $linkPage .= '<span class="layui-laypage-curr">' . $page .'</span>';
                }
            }
        }
        $pageStr     =   str_replace(
            array(
                '%header%', '%nowPage%', '%totalRow%', '%totalPage%', '%upPage%', '%downPage%',
                '%first%', '%prePage%', '%linkPage%', '%nextPage%', '%end%'
            ),
            array(
                $this->config['header'], $this->nowPage, $this->totalRows, $this->totalPages, $upPage, $downPage,
                $theFirst, $prePage, $linkPage, $nextPage, $theEnd
            ), $this->config['theme']);
        return '<div class="layui-box layui-laypage layui-laypage-default right">'.$pageStr.'</div>';
    }

}
